qa/561: be more careful with $@ quoting
qa/561: be more careful with $@ quoting

Was failing on OpenBSD where is /bin/sh is closer to the Bourne shell.

adfernandes/pcp,adfernandes/pcp,adfernandes/pcp,adfernandes/pcp,adfernandes/pcp,adfernandes/pcp,adfernandes/pcp,adfernandes/pcp